U. ALASKA 



URI 

 'U. C0NN.*5a« WHOI 



'ABERDEEN 



1EASUREMENTS 

 ON STANDARDS 



INTERCALIBRATION 



PUERTO RICO 

 NUCLEAR CENTER 



Figure 2. Environmental quality baseline data-acquisition projects. 



Frequent interchange of replicate samples is being made among the 

 various participating laboratories in the U.S.A. and United Kingdom. These 

 will provide for intercalibration of the analytical methods and procedures 

 for determination of the chlorinated organic toxins, of organic mercury 

 compounds, and of the various inorganic pollutants. From some of these 

 analyzed samples, subsamples will be reserved to be distributed for inter- 

 calibration to other laboratories that may join the programs at a later 

 date. This procedure will also be followed with some samples analyzed 

 for petroleum fractions. 



An important part of this program is the constant interchange of 

 data, both from samples and from intercalibration and reference analy- 

 ses, among the analytical laboratories and the members of the planning 

 and study committees. Such interchanges of information are useful in 

 evaluating of methods and practices and in keeping the analytical results 

 at as high a quality as can be achieved. 



